GSM Outdoors GWP-SLCR2-BT: The Silencer BT 2.0 Electronic Ear Buds features Bluetooth 5.0 which helps improve battery life and wide connection range. It has touch button controls, SAC (Sound Activated Compression), voice prompts, and auto shut off. Included is a USB Charging Dock with integrated rechargeable lithium battery, 3 sizes of Sure-Lock fins and foam tips (SM/MD/LG), cleaning brush, and Micro USB cable.